Stairway.



C. ITSCHNER.

STAIRWAY.

APPLICATION FILED FEB. a, 1918.

1. ,29 1,905 Patented Jan. 21, 1919.

7 22772665 I 0/7077ea/zi5r/277er UNITED STATES PATENT OFFICE.

CHARLES ITSCHNER, or CHICAGO, ILLINOIS, ASSIGNOR or ONE-HALF T0 FRANKLINr. SMITH, or CHICAGO, ILLINOIS.

,STAIRWAY.

Specification of Letters Patent.

Original application filed May 10, 1917, Serial No. 167,639. Divided andthis application filed February 8,

To all whom it may concern Be it known that I, CHARLES ITsCHNER, acitizen of the United States, and a resident of Chicago, county of Cook,and State of Illinois, have invented certain new and useful Improvementsin Stairways, of which the following is declared to be a full, clear,and exact description.

This invention relates to Stairways of that type shown and described inmy prior application for patent on stairways, filed May 10, 1917, SerialNo. 167,639, and the subjectmatter of this application has been dividedout of said prior application.

The object of the present invention is to provide a stairway of simple,substantial and fireproof construction; another object is to provide astairway of which the risers and sofiit portions are made up in units,or sections, each comprising a riser and soflit section ready forassembly in the building where the stairway is to be erected. With theseand other objects and advantages in view, the invention consists in theseveral novel features hereinafter set forth and claimed.

The invention is clearly illustrated in the accompanying drawing, inwhich:-Figure 1 is a vertical longitudinal section through a fragment ofa stairway embodying a simple form of the present invention, and Fig. 2is a vertical cross section taken on the line 22 of Fig. 1, the concretefiller being omitted in this view.

Referring to said drawing, the stringers of the stairway are illustratedat 13, and are preferably constructed of sheet metal having their upperedges bent outward to provide flanges 15, and having their lower edgesbent inward to provide flanges 25. tering strip 25 may be secured to oneor both of the stringers 13, as is desired, and said plastering stripmay be secured thereto as, for instance, by rivets 25 The stringers 13,are supported in place in the building in accordance with the usualpractice as is well known to those skilled in the art to which thisinvention pertains.

Each step or unit comprises a soflit portion or section 11, and a riser18, the soflit section having an upwardly bent, vertical end portion18*, which is spot-welded to the lower end portion of the riser, as at18 Each A plas- Serial No. 215,952.

riser has the usual nosing 18, at its upper end, formed with the usualreturn bend 18 which is flush with the tread of the step. The lower endof each riser is bent outward, as at 21 to provide a cove between theriser and tread of the step. The riser and adjacent soflit portion ofeach step are connected by a bar or brace rod 23, riveted, or otherwisesecured to the riser and soflit, and merely serves to hold the upper endof the riser in a braced condition until the concrete is filled in. Therisers are secured to the stringers by angle iron brackets 24, which arebolted or riveted to the risers and stringers. The soffit plates orsections 11, rest upon the inturned flanges 25, of the stringers and maybe riveted thereto. Each unit is connected to the adjacent ones byover-lapping the sofiit sections and riveting or bolting them togetherat the places where they over-lap.

The tread of the stairway is formed by filling in, with concrete 22, thespaces between the soffit sections and upper edges of the opposing bentends 18 and 21 of the nosing of one riser and cove portion of the nextadjacent riser thereabove and the upper surface of said filler ofconcrete is leveled off, as shown in the drawing, to provide the tread.

As before stated, the upper end of each soilit section and a riser aresecured together at the plant where the parts are manufactured, and thusform units which may be delivered to the place where the stairway is tobe erected. After the stringers have been secured in place, the unitscomprising a soffit section and riser are secured to the stringers byfastening the angle iron brackets thereto .with bolts and nuts 24*, andalso, by the bolts or rivets 25", which pass through the soffit sectionand inturned flanges of the stringers. The brace rods 23, are thensecured in place and the overlapping soflit sections riveted or boltedtogether after which the concrete 22, is filled in the spaces above thesoflit plates and the upper edges of the nosing and coves of the risers.

More or less variation of the exact details of construction is possiblewithout departing from the spirit of this invention; I desire,therefore, not to limit myself to the exact form of the constructionshown and described, but intend in the following claims to point out allof the invention disclosed herein. I

I' claim as new, and desire to secure by Letters Patent:

1. In a stairway, a plurality of fiat, overlapping sheet metal soflitsections secured together, said sections having upwardly bent portionsat their upper ends terminating above the tread portions of thestairway, risers, one secured to each upwardly bent portion of eachsofiit section above the tread portion, said risers having outwardlybent lower edges to form coves at the tread portions, and a pair ofSupporting stringers to which said risers are secured.

2. In a stairway, a plurality of flat, overlapping sheet metal soflitsections secured together, each soflit section having an upwardly bentend portion at its upper end, terminating above the tread portion of thestainway, risers, one for each soffit section, and having at its lowerend an outwardly bent cove portion, and at its upper end, a nosingtern'iinating in a return bend, each riser being permanently secured,above the tread portions, to the soifit section associated with it toform a unit, a pair of stringers, and brackets secured to the risers andadapt ed to be secured to the stringers.

3. In a stairway, a plurality of flat, overlapping sheet metal soffitsections secured together, said sections having upwardly bent portionsat their upper ends terminating abovethe tread portions of the stairway,risers, one permanently secured to the upper end of each soflitsectionabove the tread portion, each riser being formed with an out- .wardlybent cove portion at its lower end, and with a nosing at its upper endterminating in a rearwardly curved portion flush with the tread of thestep and in alinement with the cove portion of an adjacent riser, a pairof stringers, means for securing the risers to the stringers, and afiller in the spaces between the sofiit sections and top of one riserand cove portion of the next adj acent one.

4. In a stairway, a plurality of flat, overlapping sheet metal sofiitsections having up wardly bent end portions at their upper endsterminating above the tread portions, a plurality of risers, one foreach soflit sec tion and permanently secured to the upwardly bent endthereof above the tread por tions, each riser having an outwardly curvedcove portion at its lower end and a nosing at its upper end terminatingin a rearwardly projecting edge portion flush with the tread of thestep, and a pair of stringers, each having an outwardly bent flangeportion along its upper edge and an inwardly bent flange portion alongits lower edge underlying the soliit section, and brackets secured tothe risers and adapted to be secured to said stringers.

CHAS. rrsoHNEn' Copies of this patent may be obtained for five centseach, by addressing the "Commissioner of Patents,

Washington, 20.0.

